Initial working version

2022-12-22 20:22:22 +11:00
parent ce9675a1cc
commit ced7fa5092
902 changed files with 150252 additions and 0 deletions
@@ -0,0 +1,41 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.Header = void 0;
+const Token = require("token-types");
+const util = require("../../common/Util");
+/**
+ * BASIC STRUCTURE
+ */
+exports.Header = {
+    len: 6 * 4,
+    get: (buf, off) => {
+        const header = {
+            // word 0
+            signature: Buffer.from(buf).toString('latin1', off, off + 3),
+            // versionIndex number * 1000 (3.81 = 3810) (remember that 4-byte alignment causes this to take 4-bytes)
+            streamMinorVersion: util.getBitAllignedNumber(buf, off + 3, 0, 4),
+            streamMajorVersion: util.getBitAllignedNumber(buf, off + 3, 4, 4),
+            // word 1
+            frameCount: Token.UINT32_LE.get(buf, off + 4),
+            // word 2
+            maxLevel: Token.UINT16_LE.get(buf, off + 8),
+            sampleFrequency: [44100, 48000, 37800, 32000][util.getBitAllignedNumber(buf, off + 10, 0, 2)],
+            link: util.getBitAllignedNumber(buf, off + 10, 2, 2),
+            profile: util.getBitAllignedNumber(buf, off + 10, 4, 4),
+            maxBand: util.getBitAllignedNumber(buf, off + 11, 0, 6),
+            intensityStereo: util.isBitSet(buf, off + 11, 6),
+            midSideStereo: util.isBitSet(buf, off + 11, 7),
+            // word 3
+            titlePeak: Token.UINT16_LE.get(buf, off + 12),
+            titleGain: Token.UINT16_LE.get(buf, off + 14),
+            // word 4
+            albumPeak: Token.UINT16_LE.get(buf, off + 16),
+            albumGain: Token.UINT16_LE.get(buf, off + 18),
+            // word
+            lastFrameLength: (Token.UINT32_LE.get(buf, off + 20) >>> 20) & 0x7FF,
+            trueGapless: util.isBitSet(buf, off + 23, 0)
+        };
+        header.lastFrameLength = header.trueGapless ? (Token.UINT32_LE.get(buf, 20) >>> 20) & 0x7FF : 0;
+        return header;
+    }
+};